Entries in Collusion
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TIM SLOAN/AFP/Getty Images(ISLAMABAD, Pakistan) -- The United States' attempts to regain trust in Pakistan's intelligence service suffered a blow in the last few weeks when the CIA gathered evidence that U.S. officials believe shows collusion between militants and Pakistani security officials.

During a visit to Islamabad on Friday, CIA Director Leon Panetta confronted the head of Pakistan's intelligence service, showing him satellite and other intelligence that the CIA believes is evidence of Pakistani security's efforts to help Islamic militants based in Pakistan, according to U.S. and Pakistani officials.

According to the officials, Panetta revealed overhead imagery that showed two facilities where militants manufactured improvised explosive devices, known as IEDs, which are commonly used by militants fighting U.S. forces in Afghanistan. The "IED factories" were located in North and South Waziristan, where many militants are based.

The CIA passed intelligence in the past several weeks to their Pakistani counterparts, alerting them to the two facilities, but when Pakistani forces raided the facilities, the militants had disappeared.

In his meetings Friday, Panetta conveyed the CIA's belief that the militants had been warned by Pakistani security officials prior to the raids.

Since Osama bin Laden's death, senior U.S. officials have demanded that Pakistan prove that it intends to help crack down on terror networks within its own borders with concrete, specific steps.

On Friday, U.S. and Pakistani officials both admitted that the escape of militants making bombs for use against Americans in Afghanistan was a setback.

Pakistani officials made a rare admission that some kind of collusion was possible.

"There is a suspicion that perhaps there was a tip-off," a senior Pakistani official told the Washington Post. "It's being looked into by our people, and certainly anybody involved will be taken to task."

Pakistani officials contend that they are walking a thin line after the U.S. decided to launch a unilateral raid to kill bin Laden, balancing U.S. demands with a military rank and file that is furious and want their leaders to break with the U.S.